enholm



(No Modl.)- 2 sheets sheet 1.

0. A. BNHOLM. ARMATURB FOR DYNAMO ELECTRIC MACHINES.

Patented July 15, 1890.

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(Nb Model.) 2 Sheets-Sheet 2 0. A.-ENHOLM. ARMATURE FUR DYNAM-O ELECTRICMACHINES.

No. 432,387. Patented-July 15, 1890.

AEHV 5,

UNITED STATES PATENT OFFICE.

OSCAR AXEI. ENlIOLM, OF NEIV YORK, N. Y., ASSIGNOR, BY DIRECT AND MESNEASSIGNMJNTS, OF ONE-HALF TO JULIUS M. IlEYMAN, OF SAME PLACE, ANDEMMANUEL DURET DE BRIE, OF COGNAC, FRANCE. I

ARMATU RE OF DYNAMO-ELECTRIC MACHIN ES.

SPECIFICATION forming part of Letters Patent No. 432,387, dated July 15,1890.

Application filed November 23, 1889. $erial No. 331,349. (No model-l Toall whom it may concern: dial spurs or projections, and the successiveBe it known that I, OSCAR AXEL ENHOLM, disks are so disposed as topresent said proa citizen of the United States, residing at New jectionsin an orderly spiral arrangement with York, in the county and State ofNew York, the result of presenting twice as many longi- 5 have inventedcertain new and useful Imtudinal groups or ranks of spurs as there areprovemen-ts in the Armatures of Dynamodifferent kinds of plates. Thuswith the four Electric Machines, of which the following is forms ofplates shown in Fig. III there will a specification. be eight of suchranks of spurs, as represented My invention relates to an improved coninFigs. I and'II. With a core constructed 1o struetion of thearmature-core of a dynamo- 011 my plan the entire substance of the coreelectric machine, and is more particularly debecomes the theater oflines of magnetic force.

signed for what are known as drum-arma- 1 may represent any suitablearmaturetures, in which the winding is in meridional. shaft having acollar 2,against which one end planes about the exterior of acylindrical core. of the armature core abuts, and having a The object ofmy invention is to so conserew-threaded portion 3 for a nut 4t,by whichstruct the armature-core that it shall eonstithe parts of the cores arefirmly clamped totute a perfect magnetic bridge between the gether.

field-poles, and thus more effectually direct 5 is a brass or othernon-magnetic sleeve,

and concentrate the lines of force upon and having an internal tongue 6,Which occupies 20 through the armature, and at the same time a key-seat7 in the shaft, and having an ex be capable of a more readymagnetization and ternal groove 8 for the reception of lugs upondemagnetization as it revolves than are those the core lamimc, now to bedescribed. The forms of cylindrical armature-cores that have core properis built up of a multitude of simibeen heretofore employed. Theconstruction lar plates, disks, or laminae 9 of some ferro- 2 5 isfurther such as to prevent the formation magnetic metal,preferablysoft-charcoal iron.

of cross or false magnetic action in the core Each plate comprises acircular body or hub itself. 10, having a central orifice ll with aninte- Referring to the accompanying drawings, riorly-projecting lug 12,which, when the core Figure I is a perspective view of an armatureis puttogether, occupies the groove 8 of the 30 core embodying my invention,the polar-conbrass sleeve 5. Each plate has two diametnections andaportion of one of the non-magrically-opposite spurs or projections 13.The netic filling-blocks being omitted. Fig. II is four plates to b c dof any given series are an axial section of such arn'iature-core withprecise fac-similes of one another, except its polar block-pieces. Fig.III represents that the lug 12, which in one plate a is in 5fourconsecutiveplatesorlaminze,constituting line with one of thesespurs, is in the suea series. Fig. IV is a perspective view of a ceedingplates 1) c (1, respectively, forty-live, modification of my invention.Fig. V is a ninety, and one hundred and thirty-live deperspective viewof another modification of grees angular remove to the left of thefirstthe invention. Figs. VI and VII are pernamed. The plates of thenext series are 40 spective views of other modifications. arranged inlike succession, and so on until a The above figures represent the nakedarcore of the desired length is obtained. Be- 0 mature as it appearsbefore application of tween every two consecutive plates is interthewire. posed a Washer or gasket l4 of varnished In carrying out myinvention I construct Manila paper or other non-magnetic mate- 45 thearmature-core of a multitude of disks, rial. The plates which go to makeup any plates, or laminae of soft iron, arranged side given diametricalplane or pair of longitudi- 5 by side with interposed non-magneticgaskets nal ribs are, it will be seen, separated from or washers all atright angles to the shaft. one another by the thicknesses of three Eachdisk has two diametrieally-remote raplates and four washers. Each plateextends diametrically across from one side of the armature to the other,and is consequently adapted when revolving between the poles of thefield-magnet to partially complete the magnetic circuit between saidpoles. As these plates are straight and any one of them of small mass,each is adapted to be promptly and completely magnetized anddemagnetizethand an armature made up of a multitude of such plates isobviously capable of very rapid changes of magnetic condition. To assistin keeping the plate series at their proper angular or diametricdisplacement and to present a convenient cylindrical body for the wirewindings, segmental blocks 15, of wood or other non-magnetic substance,maybe inserted. The spurs 13 form virtually polar prolongations of thearmature-core. Soft-iron blocks or polar connections 18 may beinterposed between the consecutive spurs of each rank and be fastened bya rod 19, occupying orifices 20 in said blocks and spurs.

The above-described form of armature-core is susceptible of variousmodifications. For example, the hub or annular portion 10 may, as inFig. IV, be of such diameter as itself to constitute the cylindricalbody for the wire winding, and to thus dispense with the wooden segmentsor filling-pieces 15; or a like object may be attained by wings orlateral expansion 16.

In forms like Fig. VI insulating-wedgessuch as 15'1nay be employed. Thepolar surface of each spur may be prolonged by a lip or lateralprolongation l7 concentric with the axis of rotation. The polarconnecting-blocks 18 may have like lips or lateral prolongations, asshown at- 17, Fig. VI. The soft-iron polepiece 18 may be omitted, as inFigsLIV, and V. The tongues (or lugs) and the grooves may of course bereversed. For example, a tongue on the shaft may occupy a groove on thesleeve-bore, and a tongue 011 the sleeve may occupy notchesin theplates. The sleeve may be fastened in any other way to the shaft.

It is evident that the construction of the individual plates may be somodified as to make the number of longitudinal ranks of spurs of anyeven quantity, less or greater than eightsuch as, for example, four,six, ten, or twelve. The disposition of the tongues on the individualplates a b c (1 may be such as to group them in a left-hand instead of aright-hand spiral arrangement here shown. It is further evident that ona core such as hereinabove described the winding may be eitherlongitudinahas specified, (that is to say, meridionally over and overthe whole core;) or the armature-wire may be wound helically about eachrank of spurs in the form of sepa rate bobbins with radial axesconstituted by the respective rank of spursone rank to each bobbin.

\Vhat I claim as my invention is- 1. An armature-core for adynamo-electric machine, formed of a number of separate plates, bars, orrods of iron extending diametrically across from one side of thearmature-core to the other and arranged in diiterent diamctrical planes.

2. An armature-core for a dynamo-electric machine, formed of a series ofplates of thin sheet-iron connected to the same shaft and extendingdiametrically across from one side of the armature to the other, saidplates having each two diametrically-projecting spurs, and being sofixed as to present said spurs in different angular positions in groupsor series, as shown.

3. An armature-core for a dynamo-eleetric machine, formed of a number ofplates of thin sheet-iron extending diametrically across from one sideof the armature to the other, said plates havingdiametrieally-projeeting spurs, and being so fixed as to present saidspurs in different angular positions and dis tinct longitudinal ranks,as shown, and being separated from one another by non-magnetic material.

4. An armature-core for a dynamo-electric machine, formed of a number ofplates of thin sheet-iron, which extend diametrically across from oneside of the armature to the other, in combination with segmental blocksor fillingpieces, substantially as and for the purposes set forth.

5. An armature-core for a dynamo-electric machine, formed of a number ofthin shectiron plates, which extend diametrically across the shaft, andwhich have inwardly-projecting lugs, which occupy a grooved non-magneticsleeve, in combination with said sleeve and shaft, substantially as setforth.

6. An armature-core for a dynamo-electric machine, formed of parallelplates of thin sheet-iron, connected to the same shaft and extendingdiametrically across from one side of the armature to the other, saidplates having each two diametrically-projecting spurs, and being sofixed as.to present said spurs in diil'erent angular positions in groupsor series, as shown, and with the.spurs in longitudinal ranks, of whichall the plates in each separate rank are connected near their ends andare magnetically separated from all the intervening plates,substantially as set forth.

7. An armature-core for a dynamo'electrie machine, formed of parallelplates of thin sheet-iron, connected to the same shaft and extendingdiametrically across from one side of the armature to the other, saidplates having each two diametrically-projecting spurs, and being sofixed as to present said spurs in diiterent angular positions in groupsor series, as shown, and with the spurs in longitudinal ranks, of whichall the plates in each separate rank are magnetically connected neartheir ends by interposed polar connections 18 and are magneticallyseparated from all the intervening plates, substantially as set forth.

8. An armature-core for a dynamo-electric machine, formed of parallelplates of thin sheet-iron; connected to the same shaft and extendingdiametrically across from one side of the armature to the other, saidplates having each two diametrically-projecting spurs having lateralprolongations 17, and being so fixed as to present said spurs indifferent angular positions in groups or series, as shown, and with thespurs in longitudinal ranks, of which all the plates in each rank aremagxo netically connected near their ends by interposed polarconnections 18,havinglateral prolongations 17, which correspond with thesaid spur prolongations, and are magnetically separated from all theintervening plates, substantially as set forth.

OSCAR AXE'L ENI'IOLM.

Witnesses:

HERBERT KNIGHT, Gno. H. KNIGHT.

